JP4150420B2 - Floor structure material - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a floor structure material including a formwork used for construction of a concrete floor slab and a self-supporting truss.
[0002]
[Prior art]
As shown in the front view and a side view of FIG. 1 (b) of FIG. 1 (a), 1 pieces of the upper chord muscle 11 and two bottom chord muscles 12 are arranged in parallel vertically, two which is bent in the waveform The self-supporting truss 1 is formed by welding the upper bent portion 14 of the lattice muscle 13 to the upper chord muscle 11 and welding the lower portion of the two lattice muscles 13 to the lower chord muscle 12. The upper and lower chords 11 and 12 have ribs formed on their surfaces in order to improve adhesion to concrete.
[0003]
As shown in the front view of FIG. 5 (a) and the plan view of FIG. 5 (b) , a plurality of ribs formed by bending an iron plate at a constant interval in the direction (lateral direction) intersecting the longitudinal direction (vertical direction). A form 20 having rib groups 21 formed in parallel is formed. In addition, the collar parts 24 and 25 formed in both sides are formed in order to bite and connect the adjacent molds 2.
[0004]
Then, a floor structure material is made by spot-welding the lower bent portion 15 of the lattice 13 of the self-supporting truss 1 to a flat surface 23 existing between the rib groups 21 formed on the mold 20.
[0005]
Then, this floor structure material is bridged between the cross beams, and the floor slab is constructed by placing concrete using the steel plate mold 20 as a discarded mold.
[0006]
In this floor structure material, the bending force in the vertical direction is mainly distributed to the self-supporting truss 1 and the bending load in the horizontal direction is mainly allocated to the rib group 21 of the frame 20 and the bar arrangement applied in the horizontal direction. Has been.
[0007]
[Problems to be solved by the invention]
A floor structure material is produced by spot welding the lower bent portion 15 of the lattice 13 of the self-supporting truss 1 to a mold 20 in which a plurality of ribs 21 are formed in parallel in the longitudinal direction by bending an iron plate at regular intervals. And since the intensity | strength with respect to the bending load of a horizontal direction is weak, the horizontal reinforcement is performed.
[0008]
As shown in FIG. 5, when the rib group 21 in which a large number of ribs are arranged on the iron plate is formed, the molding is caused by the difference in residual strain between the portion where the rib group 21 is formed and the flat surface 23 where the rib group 21 is not formed. The formed steel plate form 20 becomes rough as if it swelled, and the flatness is lost. Therefore, even when the self-supporting truss 1 is placed, not all the lower bent portions 15 of the lattice muscle 13 are in contact with the mold 20.
[0009]
Even if the self-supporting truss 1 is strongly pressed against the formwork 20 and all the lower bent portions 15 of the lattice 13 are welded to the surface of the formwork to form the floor structure material, the distortion remains and the floor The posture of the structural material is not stable. Therefore, the present invention has been conceived in order to solve such problems.
[0010]
[Means for Solving the Problems]
The floor structure material of the present invention is a floor structure in which a lower bent portion 15 of a lattice 13 of a self-supporting truss 1 in which an upper bent portion 14 of a lattice 13 bent into a corrugated shape is welded to the upper chord 11 to a formwork. In the material, a large number of ribs with high projecting height are arranged at wide intervals in the direction intersecting with the longitudinal direction of the self-supporting truss 1 except for the portion where the lower bent portion 15 of the lattice 13 is welded to the mold. One rib group 21 is formed in the longitudinal direction, and the rib of the first rib group 21 is formed in a direction crossing the longitudinal direction of the self-supporting truss 1 at a portion where the lower bent portion 15 of the lattice 13 is welded. A second rib group 22 in which a large number of ribs having a low protruding height are closely arranged at narrow intervals is formed in the longitudinal direction, and the lower bent portion of the lattice 13 of the self-supporting truss 1 is formed in the second rib group 22. 15 is welded.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
In the floor structure material of the present invention, as shown in the plan view of FIG. 2, the longitudinal direction (vertical direction) of the self-supporting truss 1 except for the portion where the lower bent portion 15 of the lattice 13 of the self-supporting truss 1 is welded. The first rib group 21 in which a large number of ribs with high projecting height are arranged at wide intervals in the direction intersecting the direction (lateral direction) is formed in the vertical direction, and the lower bent portion 15 of the lattice 13 is welded For the part to be used, a mold 2 is formed by vertically forming a second rib group 22 in which a large number of ribs having a projection height lower than the ribs of the first rib group 21 are closely arranged at a narrow interval. .
[0012]
As shown in FIG. 1 , two upper chords 11 and two lower chords 12 are vertically arranged in a triangle. A self-supporting truss that is attached to the mountain so that 11 is sandwiched, the upper bent portion 14 of both lattice muscles 13 is welded to the upper chord muscle 11, and the lower part of both lattice muscles 13 is welded to the two lower chord muscles 12, respectively. 1 is used.
[0013]
As shown in the front view of FIG. 3 (a) and the plan view of FIG. 3 (b), the mold frame 2 is placed on an energizing table (not shown), and the second rib group 22 of the mold frame 2 is formed. The self-supporting truss 1 is placed so that the lower bent portion 15 of the lattice muscle 13 of the self-supporting truss 1 is aligned therewith. Then, a welding electrode (not shown) is pressed onto each lower bent portion 15 and energized between the current-carrying base and the welding electrode, so that the self-supporting truss 1 is welded to the mold 2 as shown in FIG. A floor structure material as shown in a perspective view is formed.
[0014]
In this way, in the mold 2 in which the first rib group 21 is formed, the difference in residual strain can be obtained by forming the second rib group 22 composed of ribs lower than the first rib group 21 and having a small pitch. The flatness of the mold 2 can be maintained.
[0015]
In addition, since the second rib group 22 having a small and small pitch is formed in the part of the mold 2 where the lower bent portion 15 of the lattice 13 of the self-supporting truss 1 is welded, the lower bent portion 15 is changed to the first bent portion 15. When energized in contact with the two rib groups 22, the contact area is small, so that the current flows in a concentrated manner, and heat generation is started quickly so that welding can be performed smoothly.
[0016]
In the embodiment described above, as the self-supporting truss 1, one upper chord muscle 11 and two lower chord muscles 12 are vertically arranged in a triangle, and two lattice muscles 13 bent in a waveform are arranged on the upper side thereof. Attached to the angle so that the bending portion 14 sandwiches the upper chord 11, the upper bending portions 14 of both lattice 13 are welded to the upper chord 11, and the lower portions of both lattice 13 are connected to the two lower chords 12. Although each welded one is used, as a self-supporting truss 1, one of the upper bent portions 14 of one lattice 13 is welded to one upper chord 11, and one lattice 13 is Alternatively, the floor structure material may be formed by welding the lower bent portion 15 to the second rib group 22 of the mold 2.
[0017]
【The invention's effect】
As is apparent from the description based on the above embodiment, according to the floor structure material of the present invention, the first rib group in which a large number of ribs are arranged in the mold 2 in the direction crossing the longitudinal direction of the self-supporting truss 1. 21 is formed in the longitudinal direction, and a second rib group 22 composed of ribs lower than the ribs of the first rib group and having a small pitch is formed at a portion where the lower bent portion 15 of the lattice 13 is welded. Therefore, the residual strain generated at the time of molding can be reduced to maintain the flatness of the mold frame 2 and the lattice 13 of the self-supporting truss 1 is welded to the second rib group 22, so that reliable welding can be performed. it can.
[Brief description of the drawings]
FIG. 1 is a front view (a) and a plan view (b) showing an example of a self-supporting truss used in the floor structure material of the present invention;
FIG. 2 is a plan view showing an example of a formwork used in the floor structure material of the present invention;
FIG. 3 is a front view (a) and a plan view (b) showing a floor structure material of the present invention;
FIG. 4 is a perspective view showing a floor structure material of the present invention,
FIG. 5 is a front view (a) and a plan view (b) showing an example of a formwork in a conventional floor structure material.
[Explanation of symbols]
1 Self-supporting truss
11 First quarter muscle
12 Lower chord
13 Lattice muscle
14 Upper bend
15 Lower bent part 2 Formwork
21 First rib group
22 Second rib group

Claims (1)

In the floor structure material in which the lower bent portion of the lattice muscle of the self-supporting truss welded to the upper chord is welded to the formwork, the upper bent portion of the lattice muscle bent into a waveform,
A first rib in which a large number of ribs having a high protruding height are arranged at a wide interval in the direction intersecting with the longitudinal direction of the self-supporting truss except for a portion where the lower bent portion of the lattice muscle is welded to the mold A plurality of ribs having a group protruding in the longitudinal direction and having a protruding height lower than that of the ribs of the first rib group in a direction intersecting with the longitudinal direction of the self-supporting truss at a portion where the lower bent portion of the lattice muscle is welded The floor structure material is characterized in that a second rib group is arranged in the longitudinal direction densely arranged at a narrow interval, and a lower bent portion of the lattice bar of the self-supporting truss is welded to the second rib group. .

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